#include <iostream>
#include <math.h>
using namespace std;

int main() {
    int h, r;
    int drink = 20; // 1L=1000立方厘米
    cin >> h >> r;

    double mj;
    double sheng;
    mj = 3.14 * pow(r, 2) * h;
    sheng = mj / 1000;
    cout << ceil(drink / sheng);
    return 0;
}